netdev - [PATCH net-next 17/32] net: prefer nf_ct_put instead of nf_conntrack

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Date:   Mon, 10 Jan 2022 00:16:25 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 17/32] net: prefer nf_ct_put instead of nf_conntrack_put

From: Florian Westphal <fw@...len.de>

Its the same as nf_conntrack_put(), but without the
need for an indirect call.  The downside is a module dependency on
nf_conntrack, but all of these already depend on conntrack anyway.

Cc: Paul Blakey <paulb@...lanox.com>
Cc: dev@...nvswitch.org
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_conntrack_core.c |  4 ++--
 net/openvswitch/conntrack.c       | 14 ++++++++++----
 net/sched/act_ct.c                |  6 +++---
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 7a2063abae04..c74933a6039f 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -989,7 +989,7 @@ static int __nf_ct_resolve_clash(struct sk_buff *skb,
 
 		nf_ct_acct_merge(ct, ctinfo, loser_ct);
 		nf_ct_add_to_dying_list(loser_ct);
-		nf_conntrack_put(&loser_ct->ct_general);
+		nf_ct_put(loser_ct);
 		nf_ct_set(skb, ct, ctinfo);
 
 		NF_CT_STAT_INC(net, clash_resolve);
@@ -1921,7 +1921,7 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
 		/* Invalid: inverse of the return code tells
 		 * the netfilter core what to do */
 		pr_debug("nf_conntrack_in: Can't track with proto module\n");
-		nf_conntrack_put(&ct->ct_general);
+		nf_ct_put(ct);
 		skb->_nfct = 0;
 		NF_CT_STAT_INC_ATOMIC(state->net, invalid);
 		if (ret == -NF_DROP)
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 121664e52271..a921c5c00a1b 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -574,7 +574,7 @@ ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
 			struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
 
 			nf_ct_delete(ct, 0, 0);
-			nf_conntrack_put(&ct->ct_general);
+			nf_ct_put(ct);
 		}
 	}
 
@@ -723,7 +723,7 @@ static bool skb_nfct_cached(struct net *net,
 		if (nf_ct_is_confirmed(ct))
 			nf_ct_delete(ct, 0, 0);
 
-		nf_conntrack_put(&ct->ct_general);
+		nf_ct_put(ct);
 		nf_ct_set(skb, NULL, 0);
 		return false;
 	}
@@ -967,7 +967,8 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 
 		/* Associate skb with specified zone. */
 		if (tmpl) {
-			nf_conntrack_put(skb_nfct(skb));
+			ct = nf_ct_get(skb, &ctinfo);
+			nf_ct_put(ct);
 			nf_conntrack_get(&tmpl->ct_general);
 			nf_ct_set(skb, tmpl, IP_CT_NEW);
 		}
@@ -1328,7 +1329,12 @@ int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 
 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
 {
-	nf_conntrack_put(skb_nfct(skb));
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	ct = nf_ct_get(skb, &ctinfo);
+
+	nf_ct_put(ct);
 	nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 	ovs_ct_fill_key(skb, key, false);
 
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 3fa904cf8f27..9db291b45878 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -598,7 +598,7 @@ static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
 		if (nf_ct_is_confirmed(ct))
 			nf_ct_kill(ct);
 
-		nf_conntrack_put(&ct->ct_general);
+		nf_ct_put(ct);
 		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 
 		return false;
@@ -763,7 +763,7 @@ static void tcf_ct_params_free(struct rcu_head *head)
 	tcf_ct_flow_table_put(params);
 
 	if (params->tmpl)
-		nf_conntrack_put(&params->tmpl->ct_general);
+		nf_ct_put(params->tmpl);
 	kfree(params);
 }
 
@@ -967,7 +967,7 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
 		qdisc_skb_cb(skb)->post_ct = false;
 		ct = nf_ct_get(skb, &ctinfo);
 		if (ct) {
-			nf_conntrack_put(&ct->ct_general);
+			nf_ct_put(ct);
 			nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 		}
 
-- 
2.30.2